Slotting machine



- March 8, 1932- F. E.. AURAND V1,848,817

SLOTTING MACHINE Filed May 26, 192e 2 sheets-sheet 1 Marcl'l- 8, 1932. F) E, AURAND 1,848,817

SLOTTING MAGHINE Filed My 2e, 192e 2 sheets-sheet 2 Patented Mar. 8, 1932 l FRANK n. Auml), or OAKv PARK, ILLINOIS SLOTTING Applicationy filed May 26,

This invention relates to slotting and sawing machines which areparticularly adapted for small work such as slotting commutators,

y wood sawing, and the like, where'a fine ma nipulation of the cutter is necessary.

The devices of the above type are usually provided with a suitable handle at one end and a rotatable circular saw or cutter supported on a transverse spindle at the other l0 end, the cutter being driven by an electric motor supported by the handle. Such devices have not beeny entirely satisfactory in the past because their general construction has not permitted the use of a comparatively vsmall cutter for exceptionally fine work such as automotive generators and starters.

In order that a small cutter may be used, a small driving gear must of necessity be used on the shaft with such cutter in order thatV the latter may project away from the head of the device suiliciently to make'a cut of an appreciable depth. However, if a small driving gear is attempted to be used in the devices of the past, serious difliculties 95 are bound to be encountered in affording a construction which will standup under the high rate of speed at which such devices must be driven and which construction may also be conveniently assembled so as to be practical to construct.

v This invention aims to provide a device lof the above type having an improved form of construction in which a comparatively lsmall cutter may be used, if desired, said cutter being permitted by such construction to be driven at a high rate of speed.

In order to carry out my invention I employ a construction including a forward housing section detachable from the motor housing, a very small head on said section, a separable section of the drive shaft supported in said housing section and provided with an improved thrust bearing and oiling means therefor.

The shaft extends forwardly'from' said housing section and is provided with a worm on such forwardly extending portion which meshes with a worm pinion integral on a shaft journaled in a pair of forwardly eX- tending plates detachably secured on the end MACHINE 1926. Serial No. 111,737.

of said housing section. The pinion being integral on the shaft it may be made as small as desired. Theplates in which the shaft is journalled being detachably secured to the i head for purposes of assembly, convenience in assembly is not impaired by reason of said pinion and shaft being integral.

A housing completely vencloses -the worm and pinion between Vsaid plates forming the head and permitting said worm and pinion to run in grease or oil at all times, a feature especially advantageous for high speed devices. The cutter is mounted on the pinion shaft outside of said housing or head.y

VThemotor housing is provided with an integral handlev at one end thereof, such end being cast closed and provided with a bearing for the rear end of the armature, the other end of said housing being closed by the aforementioned detachable housing section. Said .section containsa removable disc having a bearing therein for the forward end ofthe armature, said armature being provided with a fan rotatable therewith and adapted not 5 1 only to cool'the coils and bearings, but to also 75 ldirect a stream of air through a suitable nozzle forwardly along said section tothe cutter for cooling the latter and blowing away the shavings produced thereby.

The smaller cutter may be substitutedfor a larger one, if desired, for use in wood sawing, or the like, and when so used aninverted T shaped adjustable shoe is provided for attachment to the forward end ofthe device to fi permit adjusting the depth of the cutproduced `by thecutter, and for other purposes that will be, apparent hereinafter.

Other advantageous features of my invention will be apparent from the specification ""1 and claims wherein: f 90 Figure 1 is a fragmentary lon itudinal elevational view partly in section o a device embodying this invention; f Y' Fig. 2 is a sectional view taken at the line 2-2 of Figure l; v 95 Fig. 3 isa fragmentary side elevational View showing the relation ofthe cutter to the head;

Fig. 4 is a longitudinal elevational view s showing a modified use of this invention;

Fig. 5 is a perspective view showing the inverted T shaped shoe removed from the de vice; and

Fig. 6 is an end view taken at the line 6-6 of Fig. 4.

Referring to the drawings more particularly, numeral 1 designates a cylindrical motor housing preferably of a light material, such as duralumin, or other aluminum alloy, and cast integral with a handle 2. The housing 1 is cast with the right end adjacent the handle2 closed and with theleft or forward end open. A forwardly tapering housing section 3 is cast hollow with its larger end open and is bolted to the housing 1 with said end communicating therewith by means'of longitudinally extending diametrically spaced bolts 4.

An aluminum disc 5 is held by bolts 6 against a shoulder 7 cast integrally on the inner periphery of the section 3 in a trans'- verse plane and spaced slightly forwardly from the rear edge of said section. The disc 5 is provided with a longitudinal aperture 'for containing a bushing 8. The bushing 8 acts as a bearing for a connecting shaft 9. The shaft 9'is in the form of a sleeve and is adapted to connect a worm shaft 10 with the Aarmature shaft 11. The forward end of the armature shaft 11 extends into the shaft 9 and is provided with a flattened portion for cooperating with a lug 12 on the shaft 9 for rotatably securing said shafts together. The other end of the armature shaft 11 is suitably supported in a bearing, not shown, in the closed end of the housing 1.

The forward end of the section 3 is longitudinally apertured to receive a bushing 13 which acts as a bearing for the worm shaft 10.

A collar 14, preferably of steel, is secured on the shaft 10 and acts as a thrust collar therefor. A washer 15, preferably of fiber, or other suitable material, is mounted on the shaft 10 between said collar and the bushing 13. A bronze disc 16 is loosely mounted on the shaft 10 to the rear of the collar 14 and is provided with radial oil grooves 17. A second washer 18 also preferably of fiber or like material is loosely mounted on the shaft 10 between the disc 16 and a threaded plug 19, which is apertured to Yreceive said shaft and is thread-ed in the section 3. The plug 19 acts as` a bearing for the rear end of the shaft 10 and also to keep the oil from Aflowing back into the after portion of the section 3. The forward end of the section 3 is vertically slotted to provide a reduced portion 20 on either side of which is bolted a forwardly extendingplate 21. Each of the plates 21 is provided with a transverse aperture in which is journalled a sleeve 22, preferably of bronze or other material softer than steel, constituting a shaft and having a worm pinion 23 integral therewith, disposed between the plates 21 and in mesh with a worm 24 integral on the shaft 10. The sleeve 22 extends slightly beyond the outside of the plate 21 at either end and has frictionally secured thereto at one of said ends a circular cutter 24. rEhe cutter 24 is secured to the sleeve 22 by means of a bolt 25, which extends through the center of said cutter and the said sleeve. The cutter 24 may be secured on either end of the sleeve 22, depending upon whether the operator of the device is right handed or left handed. The profile of each of the plates 21 is substantially as shown in Figure 1 with an arcuate portion at the lower edge of said plate concentric with the pinion 23 and projecting slightly beyond the outer periphery of said pinion. The for* ward edge of each plate extends from the upper corner thereof to such arcuate portion and is forward of the forwardmost portion `of the Worm 24 or the pinion 23. Thus a plate 26 extending between the edges of the plates 21 and provided with a pair of transversely spaced flaps 27 at its upper and lower ends completely encloses the worm 24 and pinion.

'23 between said plates 21. Bolts 28, the same that secure the plates 21 to the section 3, eX- tend through the flaps 27 and act to hold the plate 26 in position over the forward upper and lower edges of said plates 21.

The cylindrical housing 1 is provided with a series of circumferentially arranged apertures 29 at each end thereof. A fan 3() is splined on the armature shaft 10 adjacent the forward series of apertures 29, and is adapted to create a circulation of air through said apertures for cooling the coils and for directing a stream of air into an arcuate nozzle 31, which extends from over certain of the apertures 29 forwardly and downwardly along the periphery of the section'3 in the direction of the cutter 24.

The construction of the device is such that the driving motor within the housing 1 may be of Very high speed as, for instance, 6,000 revolutions per minute. The motor within the housing 1 is driven from a source of electricity which communicates with said motor through a lead 32 extending into the bottom of the handle 2 to a trigger switch 33 and thence to said motor. The motor is preferably a universal one so that it may be c onveniently used, whether the source is alternat ing or direct current.

In the operation of the device it needs only to be grasped by the handle 2 and the motor started by closing the switch 33. During the cutting operation the device may be drawn towards the operator as well as pushed ,away from him. Although the cutter travels at exceedingly high speed, the worm 24 and pinion 23 will not get hot because they arecontinually run in grease or oil. The thrust collar 14 on the shaft 10 will not get hot due to the improved bearing and oiling means therefor. The fan 30 and nozzle 31 provides not only for the cooling of the coils and bearings associated withythe motor h0u'sing,but :also provide for cooling the cutter 24,'in addition to the function ofblowing-awaythe shavings from said cut-ter.`

'-'It will be obvious to those skilled the art that Vthe foregoing device is veliicient and rugged and that the part-s thereof are readil accessible for renewal and repair. Incase it is desired to use the foregoingdevice forwood sawing, or the like, an inverted VT shaped shoe 34 is provided having a pair of vertical slots 35 in the upright portion thereofand transversely spaced from each other a distance slightly greater than the space between the plates 21.- A-central longitudinal slot 36 extends rearwardly from vtheforward edge f' of the shoe 34. TheV forward lower edges of the shoe 34 on Aeither side of the slot 36 are beveled and lnurled as shown, for a purpose that will presentlyVV be described.

The platef26 is provided with a pair of trans- 4cutting saw 24a, usually of a much larger diameter than the cutter 24, is used. When used with the shoe 34V the device may be pivoted therewith as a unit about the knurled beveled edge at the forward end of. said shoe, as for instance, when initially cutting into the floor. The depth at which the saw 24a will cut into the floorY may be varied by adjusting the screws '37 in the slot 35. The knurled edges'onthe shoe 34 will prevent the device from kicking back as the saw 24a is entering the Hoor. Y Y

I am aware that many changes may be made and many details ofl construction varied throughout a wide range without .departing from the principle of my invention, and I do not propose limiting the patent grantedhereon otherwise than necessitated by the scope of the appended claims. f

' l. In a machine of the character described, a housing section having its sides cut away at one end to provide lateral recesses, supporting plates fitting into said recesses and removably secured to the housing section, the supporting plates projectingv forwardly beyond the end of said housing section, a shaft rotatably mounted in said plates and having one end projecting beyond the outer face of the contiguous plate, a cutter secured to the projecting end of the shaft, a drive shaft mounted 1n the housing section and extending between the- "plates, driving connections between said shafts, andaplate member disposed between said plates, said member ein tending about, thelouter edgesof-the plates and providing therewith a lubricant; retaining housing forV said 'drivingconnections.V

2. In a machine of the character: described, a motorl including a housing, a housingsection extending forwardly from the motor housing, a cutter at the forward end of said section, driving connections between the cutter and the motor, a nozzle vof channel cross section disposed substantially concentric with Y i i the housingv section and closely adjacent thereto with its lateral i flanges'y bearing i against said section, thev outlet ofthe nozzle beingdisposed to direct a'streamofair over the cutter, .and means'for causing airtoi circulate through the motorand for supplying air under pressure tothe nozzle. z .Y a

3.- In a machine of the character described, a motor including. al hous1ng, a housing-sectionj extending forwardly from the motor housing, a cutter at the forward endv of said section, driving connections between the cutter and `the motor, a nozzle of channel cross section disposed. substantially vconcentric with the housing sectionand closely adjacent thereto with its lateral flanges bear-ing against saidsection, the outlet of the nozzle being disposed to direct-a stream. of air over the cutter, and means for supplyingV air under pressure to the nozzle. L 4'. In amachine of the character a housingv section having its sides cut Vaway vat one end to provide lateral recesses, sup

porting plates-seating in said V.recesses and projecting beyond the forward end of the housing section, said plates being withinthe .periphery of the forward end of the housing section, a first shaftrotatably mounted in the housing section and extending between the plates, a. .second shaft rotatably Ymounted'in the; plates, driving connections between the shafts,`meansfor securing a tool element on .the secondshaft, and closure means extend'- ing' between said plates and disposed. Hush with the outer edges. thereof and providing therewith a, lubricant retaining housing 'for said driving connections. :f 5. vIn a machine of the character described, a housing section, a driven shaft rotatably mounted inthe housing section substantially axially thereof, said section vbeing cut away from. eachv side fat its forwardpo`rtion,"the ,thickness of the forward'portion of the housL ing sectionr corresponding approximately to the diameterfof saidl shaft, supporting plates seating in the lateral recess'esof the forward portion of the housingr section, the distance described,

between the outer faces of said plates being within the diameter ofthe fforwardpend" of the housing section Aadjacent the vcut VV'away l portion thereof, a second shaft rotatably *no mounted in'- the supporting plates, driving "ifo connections between the shafts, andmeans for securing a tool element to said second shaft. Y

6. In a machine of the-character described, a housing section having its sides cut away at one end Vto provide lateral recesses, supporting plates seating in said recesses, a first shaft rotatably mounted in the housing section, a second shaft rotatably mounted 1n the plates, driving connections between the shafts, a closure plate spanning the space between the supporting plates, and extending about the edges of said supporting plates, the closure plate having elements extending across the outer faces of the supporting plates, and securing bolts passing through said members, said bolts passing through the supporting plates and the laterally recessed portionof the housing section. v

7. In a machine of the character described, a motor including a housing, a housingsectionsextendingv forwardly from the motor housing and tapering toward its forward end, a cutter at the forward end of said section, driving connectionsbetween the cutter and .the motor, a nozzle open at its forward end and having a peripheral flange seating on the forward portion of the 'motor housing and on the housing section, the motor housing having air outlet openings enclosed by the noz- -zle,.and means for causing a-current of air to flow through the motor housing and through said openings into the nozzle.

8l In a machine of the character described, a motor including al cylindrical housing, a housing section extending forwardly from the motor housing and tapering toward its forward end, a cutter at the forward end lof said section, driving connections between the cutter and the motor, a nozzle open at its forward end and having a peripheral flange seating on the forward portion of the motor housing and on the housing section, said nozzle being arched longitudinally substantially in accordance with the taper of the housing section, means for securing the nozzle in position, and means for causing a current of air to flow through said nozzle.

9. In a machine of the character described, a housing section, spaced supporting plates secured to and projecting beyond said section, one of the plates being removable, a rotatably mounted shaft having its ends journaled in the plates, said shaft having an integral wormv `wheel disposed between the plates, la bolt secured through said shaft, means carried by the bolt and cooperating with one end of the shaft' for clamping a tool to said shaft, a drive shaft, and aworm secured to the drive shaft and meshing with said worm wheel.

10. In a machine of the character described, a housing section, spaced supporting plates secured to and projecting beyond said section, one ofthe plates being removable, a rotata worm secured to the drive shaft and meshing with said worm wheel.

11. In a machine of the character described, a housing section, spaced supporting plates secured to and projecting beyond said section, a worm wheel disposed between the plates and having end elements journalled in said plates, and a drive shaft having an integral worm disposed between the plates and meshing with said worm wheel, the diameter of the worm corresponding to the width of the space between the plates.

12. In a machine of the character described, Y

a housing section, spaced supporting plates secured to and projecting forwardly of said section, a worm wheel disposed between the plates and having end elements journalled in said plates'and projecting beyond the outer faces thereof, a drive shaft journalled in the housing section and having an integral worm disposed between the plates and meshing with theworm wheel, said worm being of approximately the same diameter as the shaft, and a bolt passing through the worm wheel and cooperating therewith to clamp a tool to the said wheel. j

13. In a machine ofthe character described,

a housing section, spaced supporting plates projecting from the forward end of said section in alignment therewith and disposed substantially within the outline of the forward end of the housing section, a rotatably mounted worm wheel Vdisposed entirely between the plates with its axis of rotation an appreciable distance above the bottom of the housing'section, a drive shaft mounted in said housing-section and provided with a worm meshing with said worm wheel', the portion of the worm which meshes with the worm wheel being disposed entirely between said plates, and closure means disposed adjacent the housing section and extending about said plates flush with the outer edges thereof and providing therewith a housing to confine a lubricant between the plates for lubricating the worm and worm wheel connection.

In witness whereof, I hereunto subscribe my name this 10th day of May, 1926. FRANK E. AURAND.

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